\(a,A=\left(5x+2y\right)^2=\left(5x\right)^2+2.5x.2y+\left(2y\right)^2=25x^2+20xy+4y^2\)\(b,B=\left(4x-y\right)^2=\left(4x\right)^2-2.4x.y+y^2=16y^2-8xy+y^2\)\(c,C=9x^2-25=\left(3x\right)^2-5^2=\left(3x+5\right)\left(3x-5\right)\)\(d,D=\left(x+2\right)^3=x^3+6x^2+12x+8\)\(e,E=\left(3x-1\right)^3=27x^3-27x^2+9x-1\)\(g,G=x^3+64=x^3+4^3=\left(x+4\right)\left(x^2-4x+16\right)\)\(h,H=27x^3-1=\left(3x\right)^3-1=\left(3x-1\right)\left(9x^2+3x+1\right)\)